1 /* 2 * JFFS2 -- Journalling Flash File System, Version 2. 3 * 4 * Copyright (C) 2006 NEC Corporation 5 * 6 * Created by KaiGai Kohei <kaigai@ak.jp.nec.com> 7 * 8 * For licensing information, see the file 'LICENCE' in this directory. 9 * 10 */ 11 #include <linux/kernel.h> 12 #include <linux/slab.h> 13 #include <linux/fs.h> 14 #include <linux/time.h> 15 #include <linux/pagemap.h> 16 #include <linux/highmem.h> 17 #include <linux/crc32.h> 18 #include <linux/jffs2.h> 19 #include <linux/xattr.h> 20 #include <linux/mtd/mtd.h> 21 #include "nodelist.h" 22 /* -------- xdatum related functions ---------------- 23 * xattr_datum_hashkey(xprefix, xname, xvalue, xsize) 24 * is used to calcurate xdatum hashkey. The reminder of hashkey into XATTRINDEX_HASHSIZE is 25 * the index of the xattr name/value pair cache (c->xattrindex). 26 * is_xattr_datum_unchecked(c, xd) 27 * returns 1, if xdatum contains any unchecked raw nodes. if all raw nodes are not 28 * unchecked, it returns 0. 29 * unload_xattr_datum(c, xd) 30 * is used to release xattr name/value pair and detach from c->xattrindex. 31 * reclaim_xattr_datum(c) 32 * is used to reclaim xattr name/value pairs on the xattr name/value pair cache when 33 * memory usage by cache is over c->xdatum_mem_threshold. Currentry, this threshold 34 * is hard coded as 32KiB. 35 * do_verify_xattr_datum(c, xd) 36 * is used to load the xdatum informations without name/value pair from the medium. 37 * It's necessary once, because those informations are not collected during mounting 38 * process when EBS is enabled. 39 * 0 will be returned, if success. An negative return value means recoverable error, and 40 * positive return value means unrecoverable error. Thus, caller must remove this xdatum 41 * and xref when it returned positive value. 42 * do_load_xattr_datum(c, xd) 43 * is used to load name/value pair from the medium. 44 * The meanings of return value is same as do_verify_xattr_datum(). 45 * load_xattr_datum(c, xd) 46 * is used to be as a wrapper of do_verify_xattr_datum() and do_load_xattr_datum(). 47 * If xd need to call do_verify_xattr_datum() at first, it's called before calling 48 * do_load_xattr_datum(). The meanings of return value is same as do_verify_xattr_datum(). 49 * save_xattr_datum(c, xd) 50 * is used to write xdatum to medium. xd->version will be incremented. 51 * create_xattr_datum(c, xprefix, xname, xvalue, xsize) 52 * is used to create new xdatum and write to medium. 53 * unrefer_xattr_datum(c, xd) 54 * is used to delete a xdatum. When nobody refers this xdatum, JFFS2_XFLAGS_DEAD 55 * is set on xd->flags and chained xattr_dead_list or release it immediately. 56 * In the first case, the garbage collector release it later. 57 * -------------------------------------------------- */ 58 static uint32_t xattr_datum_hashkey(int xprefix, const char *xname, const char *xvalue, int xsize) 59 { 60 int name_len = strlen(xname); 61 62 return crc32(xprefix, xname, name_len) ^ crc32(xprefix, xvalue, xsize); 63 } 64 65 static int is_xattr_datum_unchecked(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 66 { 67 struct jffs2_raw_node_ref *raw; 68 int rc = 0; 69 70 spin_lock(&c->erase_completion_lock); 71 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { 72 if (ref_flags(raw) == REF_UNCHECKED) { 73 rc = 1; 74 break; 75 } 76 } 77 spin_unlock(&c->erase_completion_lock); 78 return rc; 79 } 80 81 static void unload_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 82 { 83 /* must be called under down_write(xattr_sem) */ 84 D1(dbg_xattr("%s: xid=%u, version=%u\n", __FUNCTION__, xd->xid, xd->version)); 85 if (xd->xname) { 86 c->xdatum_mem_usage -= (xd->name_len + 1 + xd->value_len); 87 kfree(xd->xname); 88 } 89 90 list_del_init(&xd->xindex); 91 xd->hashkey = 0; 92 xd->xname = NULL; 93 xd->xvalue = NULL; 94 } 95 96 static void reclaim_xattr_datum(struct jffs2_sb_info *c) 97 { 98 /* must be called under down_write(xattr_sem) */ 99 struct jffs2_xattr_datum *xd, *_xd; 100 uint32_t target, before; 101 static int index = 0; 102 int count; 103 104 if (c->xdatum_mem_threshold > c->xdatum_mem_usage) 105 return; 106 107 before = c->xdatum_mem_usage; 108 target = c->xdatum_mem_usage * 4 / 5; /* 20% reduction */ 109 for (count = 0; count < XATTRINDEX_HASHSIZE; count++) { 110 list_for_each_entry_safe(xd, _xd, &c->xattrindex[index], xindex) { 111 if (xd->flags & JFFS2_XFLAGS_HOT) { 112 xd->flags &= ~JFFS2_XFLAGS_HOT; 113 } else if (!(xd->flags & JFFS2_XFLAGS_BIND)) { 114 unload_xattr_datum(c, xd); 115 } 116 if (c->xdatum_mem_usage <= target) 117 goto out; 118 } 119 index = (index+1) % XATTRINDEX_HASHSIZE; 120 } 121 out: 122 JFFS2_NOTICE("xdatum_mem_usage from %u byte to %u byte (%u byte reclaimed)\n", 123 before, c->xdatum_mem_usage, before - c->xdatum_mem_usage); 124 } 125 126 static int do_verify_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 127 { 128 /* must be called under down_write(xattr_sem) */ 129 struct jffs2_eraseblock *jeb; 130 struct jffs2_raw_node_ref *raw; 131 struct jffs2_raw_xattr rx; 132 size_t readlen; 133 uint32_t crc, offset, totlen; 134 int rc; 135 136 spin_lock(&c->erase_completion_lock); 137 offset = ref_offset(xd->node); 138 if (ref_flags(xd->node) == REF_PRISTINE) 139 goto complete; 140 spin_unlock(&c->erase_completion_lock); 141 142 rc = jffs2_flash_read(c, offset, sizeof(rx), &readlen, (char *)&rx); 143 if (rc || readlen != sizeof(rx)) { 144 JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n", 145 rc, sizeof(rx), readlen, offset); 146 return rc ? rc : -EIO; 147 } 148 crc = crc32(0, &rx, sizeof(rx) - 4); 149 if (crc != je32_to_cpu(rx.node_crc)) { 150 JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", 151 offset, je32_to_cpu(rx.hdr_crc), crc); 152 xd->flags |= JFFS2_XFLAGS_INVALID; 153 return EIO; 154 } 155 totlen = PAD(sizeof(rx) + rx.name_len + 1 + je16_to_cpu(rx.value_len)); 156 if (je16_to_cpu(rx.magic) != JFFS2_MAGIC_BITMASK 157 || je16_to_cpu(rx.nodetype) != JFFS2_NODETYPE_XATTR 158 || je32_to_cpu(rx.totlen) != totlen 159 || je32_to_cpu(rx.xid) != xd->xid 160 || je32_to_cpu(rx.version) != xd->version) { 161 JFFS2_ERROR("inconsistent xdatum at %#08x, magic=%#04x/%#04x, " 162 "nodetype=%#04x/%#04x, totlen=%u/%u, xid=%u/%u, version=%u/%u\n", 163 offset, je16_to_cpu(rx.magic), JFFS2_MAGIC_BITMASK, 164 je16_to_cpu(rx.nodetype), JFFS2_NODETYPE_XATTR, 165 je32_to_cpu(rx.totlen), totlen, 166 je32_to_cpu(rx.xid), xd->xid, 167 je32_to_cpu(rx.version), xd->version); 168 xd->flags |= JFFS2_XFLAGS_INVALID; 169 return EIO; 170 } 171 xd->xprefix = rx.xprefix; 172 xd->name_len = rx.name_len; 173 xd->value_len = je16_to_cpu(rx.value_len); 174 xd->data_crc = je32_to_cpu(rx.data_crc); 175 176 spin_lock(&c->erase_completion_lock); 177 complete: 178 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { 179 jeb = &c->blocks[ref_offset(raw) / c->sector_size]; 180 totlen = PAD(ref_totlen(c, jeb, raw)); 181 if (ref_flags(raw) == REF_UNCHECKED) { 182 c->unchecked_size -= totlen; c->used_size += totlen; 183 jeb->unchecked_size -= totlen; jeb->used_size += totlen; 184 } 185 raw->flash_offset = ref_offset(raw) | ((xd->node==raw) ? REF_PRISTINE : REF_NORMAL); 186 } 187 spin_unlock(&c->erase_completion_lock); 188 189 /* unchecked xdatum is chained with c->xattr_unchecked */ 190 list_del_init(&xd->xindex); 191 192 dbg_xattr("success on verfying xdatum (xid=%u, version=%u)\n", 193 xd->xid, xd->version); 194 195 return 0; 196 } 197 198 static int do_load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 199 { 200 /* must be called under down_write(xattr_sem) */ 201 char *data; 202 size_t readlen; 203 uint32_t crc, length; 204 int i, ret, retry = 0; 205 206 BUG_ON(ref_flags(xd->node) != REF_PRISTINE); 207 BUG_ON(!list_empty(&xd->xindex)); 208 retry: 209 length = xd->name_len + 1 + xd->value_len; 210 data = kmalloc(length, GFP_KERNEL); 211 if (!data) 212 return -ENOMEM; 213 214 ret = jffs2_flash_read(c, ref_offset(xd->node)+sizeof(struct jffs2_raw_xattr), 215 length, &readlen, data); 216 217 if (ret || length!=readlen) { 218 JFFS2_WARNING("jffs2_flash_read() returned %d, request=%d, readlen=%zu, at %#08x\n", 219 ret, length, readlen, ref_offset(xd->node)); 220 kfree(data); 221 return ret ? ret : -EIO; 222 } 223 224 data[xd->name_len] = '\0'; 225 crc = crc32(0, data, length); 226 if (crc != xd->data_crc) { 227 JFFS2_WARNING("node CRC failed (JFFS2_NODETYPE_XREF)" 228 " at %#08x, read: 0x%08x calculated: 0x%08x\n", 229 ref_offset(xd->node), xd->data_crc, crc); 230 kfree(data); 231 xd->flags |= JFFS2_XFLAGS_INVALID; 232 return EIO; 233 } 234 235 xd->flags |= JFFS2_XFLAGS_HOT; 236 xd->xname = data; 237 xd->xvalue = data + xd->name_len+1; 238 239 c->xdatum_mem_usage += length; 240 241 xd->hashkey = xattr_datum_hashkey(xd->xprefix, xd->xname, xd->xvalue, xd->value_len); 242 i = xd->hashkey % XATTRINDEX_HASHSIZE; 243 list_add(&xd->xindex, &c->xattrindex[i]); 244 if (!retry) { 245 retry = 1; 246 reclaim_xattr_datum(c); 247 if (!xd->xname) 248 goto retry; 249 } 250 251 dbg_xattr("success on loading xdatum (xid=%u, xprefix=%u, xname='%s')\n", 252 xd->xid, xd->xprefix, xd->xname); 253 254 return 0; 255 } 256 257 static int load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 258 { 259 /* must be called under down_write(xattr_sem); 260 * rc < 0 : recoverable error, try again 261 * rc = 0 : success 262 * rc > 0 : Unrecoverable error, this node should be deleted. 263 */ 264 int rc = 0; 265 266 BUG_ON(xd->flags & JFFS2_XFLAGS_DEAD); 267 if (xd->xname) 268 return 0; 269 if (xd->flags & JFFS2_XFLAGS_INVALID) 270 return EIO; 271 if (unlikely(is_xattr_datum_unchecked(c, xd))) 272 rc = do_verify_xattr_datum(c, xd); 273 if (!rc) 274 rc = do_load_xattr_datum(c, xd); 275 return rc; 276 } 277 278 static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 279 { 280 /* must be called under down_write(xattr_sem) */ 281 struct jffs2_raw_xattr rx; 282 struct kvec vecs[2]; 283 size_t length; 284 int rc, totlen; 285 uint32_t phys_ofs = write_ofs(c); 286 287 BUG_ON(!xd->xname); 288 BUG_ON(xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)); 289 290 vecs[0].iov_base = ℞ 291 vecs[0].iov_len = sizeof(rx); 292 vecs[1].iov_base = xd->xname; 293 vecs[1].iov_len = xd->name_len + 1 + xd->value_len; 294 totlen = vecs[0].iov_len + vecs[1].iov_len; 295 296 /* Setup raw-xattr */ 297 memset(&rx, 0, sizeof(rx)); 298 rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 299 rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR); 300 rx.totlen = cpu_to_je32(PAD(totlen)); 301 rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4)); 302 303 rx.xid = cpu_to_je32(xd->xid); 304 rx.version = cpu_to_je32(++xd->version); 305 rx.xprefix = xd->xprefix; 306 rx.name_len = xd->name_len; 307 rx.value_len = cpu_to_je16(xd->value_len); 308 rx.data_crc = cpu_to_je32(crc32(0, vecs[1].iov_base, vecs[1].iov_len)); 309 rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_raw_xattr) - 4)); 310 311 rc = jffs2_flash_writev(c, vecs, 2, phys_ofs, &length, 0); 312 if (rc || totlen != length) { 313 JFFS2_WARNING("jffs2_flash_writev()=%d, req=%u, wrote=%zu, at %#08x\n", 314 rc, totlen, length, phys_ofs); 315 rc = rc ? rc : -EIO; 316 if (length) 317 jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(totlen), NULL); 318 319 return rc; 320 } 321 /* success */ 322 jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(totlen), (void *)xd); 323 324 dbg_xattr("success on saving xdatum (xid=%u, version=%u, xprefix=%u, xname='%s')\n", 325 xd->xid, xd->version, xd->xprefix, xd->xname); 326 327 return 0; 328 } 329 330 static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c, 331 int xprefix, const char *xname, 332 const char *xvalue, int xsize) 333 { 334 /* must be called under down_write(xattr_sem) */ 335 struct jffs2_xattr_datum *xd; 336 uint32_t hashkey, name_len; 337 char *data; 338 int i, rc; 339 340 /* Search xattr_datum has same xname/xvalue by index */ 341 hashkey = xattr_datum_hashkey(xprefix, xname, xvalue, xsize); 342 i = hashkey % XATTRINDEX_HASHSIZE; 343 list_for_each_entry(xd, &c->xattrindex[i], xindex) { 344 if (xd->hashkey==hashkey 345 && xd->xprefix==xprefix 346 && xd->value_len==xsize 347 && !strcmp(xd->xname, xname) 348 && !memcmp(xd->xvalue, xvalue, xsize)) { 349 atomic_inc(&xd->refcnt); 350 return xd; 351 } 352 } 353 354 /* Not found, Create NEW XATTR-Cache */ 355 name_len = strlen(xname); 356 357 xd = jffs2_alloc_xattr_datum(); 358 if (!xd) 359 return ERR_PTR(-ENOMEM); 360 361 data = kmalloc(name_len + 1 + xsize, GFP_KERNEL); 362 if (!data) { 363 jffs2_free_xattr_datum(xd); 364 return ERR_PTR(-ENOMEM); 365 } 366 strcpy(data, xname); 367 memcpy(data + name_len + 1, xvalue, xsize); 368 369 atomic_set(&xd->refcnt, 1); 370 xd->xid = ++c->highest_xid; 371 xd->flags |= JFFS2_XFLAGS_HOT; 372 xd->xprefix = xprefix; 373 374 xd->hashkey = hashkey; 375 xd->xname = data; 376 xd->xvalue = data + name_len + 1; 377 xd->name_len = name_len; 378 xd->value_len = xsize; 379 xd->data_crc = crc32(0, data, xd->name_len + 1 + xd->value_len); 380 381 rc = save_xattr_datum(c, xd); 382 if (rc) { 383 kfree(xd->xname); 384 jffs2_free_xattr_datum(xd); 385 return ERR_PTR(rc); 386 } 387 388 /* Insert Hash Index */ 389 i = hashkey % XATTRINDEX_HASHSIZE; 390 list_add(&xd->xindex, &c->xattrindex[i]); 391 392 c->xdatum_mem_usage += (xd->name_len + 1 + xd->value_len); 393 reclaim_xattr_datum(c); 394 395 return xd; 396 } 397 398 static void unrefer_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 399 { 400 /* must be called under down_write(xattr_sem) */ 401 if (atomic_dec_and_lock(&xd->refcnt, &c->erase_completion_lock)) { 402 unload_xattr_datum(c, xd); 403 xd->flags |= JFFS2_XFLAGS_DEAD; 404 if (xd->node == (void *)xd) { 405 BUG_ON(!(xd->flags & JFFS2_XFLAGS_INVALID)); 406 jffs2_free_xattr_datum(xd); 407 } else { 408 list_add(&xd->xindex, &c->xattr_dead_list); 409 } 410 spin_unlock(&c->erase_completion_lock); 411 412 dbg_xattr("xdatum(xid=%u, version=%u) was removed.\n", 413 xd->xid, xd->version); 414 } 415 } 416 417 /* -------- xref related functions ------------------ 418 * verify_xattr_ref(c, ref) 419 * is used to load xref information from medium. Because summary data does not 420 * contain xid/ino, it's necessary to verify once while mounting process. 421 * save_xattr_ref(c, ref) 422 * is used to write xref to medium. If delete marker is marked, it write 423 * a delete marker of xref into medium. 424 * create_xattr_ref(c, ic, xd) 425 * is used to create a new xref and write to medium. 426 * delete_xattr_ref(c, ref) 427 * is used to delete jffs2_xattr_ref. It marks xref XREF_DELETE_MARKER, 428 * and allows GC to reclaim those physical nodes. 429 * jffs2_xattr_delete_inode(c, ic) 430 * is called to remove xrefs related to obsolete inode when inode is unlinked. 431 * jffs2_xattr_free_inode(c, ic) 432 * is called to release xattr related objects when unmounting. 433 * check_xattr_ref_inode(c, ic) 434 * is used to confirm inode does not have duplicate xattr name/value pair. 435 * -------------------------------------------------- */ 436 static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 437 { 438 struct jffs2_eraseblock *jeb; 439 struct jffs2_raw_node_ref *raw; 440 struct jffs2_raw_xref rr; 441 size_t readlen; 442 uint32_t crc, offset, totlen; 443 int rc; 444 445 spin_lock(&c->erase_completion_lock); 446 if (ref_flags(ref->node) != REF_UNCHECKED) 447 goto complete; 448 offset = ref_offset(ref->node); 449 spin_unlock(&c->erase_completion_lock); 450 451 rc = jffs2_flash_read(c, offset, sizeof(rr), &readlen, (char *)&rr); 452 if (rc || sizeof(rr) != readlen) { 453 JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu, at %#08x\n", 454 rc, sizeof(rr), readlen, offset); 455 return rc ? rc : -EIO; 456 } 457 /* obsolete node */ 458 crc = crc32(0, &rr, sizeof(rr) - 4); 459 if (crc != je32_to_cpu(rr.node_crc)) { 460 JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", 461 offset, je32_to_cpu(rr.node_crc), crc); 462 return EIO; 463 } 464 if (je16_to_cpu(rr.magic) != JFFS2_MAGIC_BITMASK 465 || je16_to_cpu(rr.nodetype) != JFFS2_NODETYPE_XREF 466 || je32_to_cpu(rr.totlen) != PAD(sizeof(rr))) { 467 JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, " 468 "nodetype=%#04x/%#04x, totlen=%u/%zu\n", 469 offset, je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK, 470 je16_to_cpu(rr.nodetype), JFFS2_NODETYPE_XREF, 471 je32_to_cpu(rr.totlen), PAD(sizeof(rr))); 472 return EIO; 473 } 474 ref->ino = je32_to_cpu(rr.ino); 475 ref->xid = je32_to_cpu(rr.xid); 476 ref->xseqno = je32_to_cpu(rr.xseqno); 477 if (ref->xseqno > c->highest_xseqno) 478 c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER); 479 480 spin_lock(&c->erase_completion_lock); 481 complete: 482 for (raw=ref->node; raw != (void *)ref; raw=raw->next_in_ino) { 483 jeb = &c->blocks[ref_offset(raw) / c->sector_size]; 484 totlen = PAD(ref_totlen(c, jeb, raw)); 485 if (ref_flags(raw) == REF_UNCHECKED) { 486 c->unchecked_size -= totlen; c->used_size += totlen; 487 jeb->unchecked_size -= totlen; jeb->used_size += totlen; 488 } 489 raw->flash_offset = ref_offset(raw) | ((ref->node==raw) ? REF_PRISTINE : REF_NORMAL); 490 } 491 spin_unlock(&c->erase_completion_lock); 492 493 dbg_xattr("success on verifying xref (ino=%u, xid=%u) at %#08x\n", 494 ref->ino, ref->xid, ref_offset(ref->node)); 495 return 0; 496 } 497 498 static int save_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 499 { 500 /* must be called under down_write(xattr_sem) */ 501 struct jffs2_raw_xref rr; 502 size_t length; 503 uint32_t xseqno, phys_ofs = write_ofs(c); 504 int ret; 505 506 rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 507 rr.nodetype = cpu_to_je16(JFFS2_NODETYPE_XREF); 508 rr.totlen = cpu_to_je32(PAD(sizeof(rr))); 509 rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4)); 510 511 xseqno = (c->highest_xseqno += 2); 512 if (is_xattr_ref_dead(ref)) { 513 xseqno |= XREF_DELETE_MARKER; 514 rr.ino = cpu_to_je32(ref->ino); 515 rr.xid = cpu_to_je32(ref->xid); 516 } else { 517 rr.ino = cpu_to_je32(ref->ic->ino); 518 rr.xid = cpu_to_je32(ref->xd->xid); 519 } 520 rr.xseqno = cpu_to_je32(xseqno); 521 rr.node_crc = cpu_to_je32(crc32(0, &rr, sizeof(rr) - 4)); 522 523 ret = jffs2_flash_write(c, phys_ofs, sizeof(rr), &length, (char *)&rr); 524 if (ret || sizeof(rr) != length) { 525 JFFS2_WARNING("jffs2_flash_write() returned %d, request=%zu, retlen=%zu, at %#08x\n", 526 ret, sizeof(rr), length, phys_ofs); 527 ret = ret ? ret : -EIO; 528 if (length) 529 jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(sizeof(rr)), NULL); 530 531 return ret; 532 } 533 /* success */ 534 ref->xseqno = xseqno; 535 jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(sizeof(rr)), (void *)ref); 536 537 dbg_xattr("success on saving xref (ino=%u, xid=%u)\n", ref->ic->ino, ref->xd->xid); 538 539 return 0; 540 } 541 542 static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, 543 struct jffs2_xattr_datum *xd) 544 { 545 /* must be called under down_write(xattr_sem) */ 546 struct jffs2_xattr_ref *ref; 547 int ret; 548 549 ref = jffs2_alloc_xattr_ref(); 550 if (!ref) 551 return ERR_PTR(-ENOMEM); 552 ref->ic = ic; 553 ref->xd = xd; 554 555 ret = save_xattr_ref(c, ref); 556 if (ret) { 557 jffs2_free_xattr_ref(ref); 558 return ERR_PTR(ret); 559 } 560 561 /* Chain to inode */ 562 ref->next = ic->xref; 563 ic->xref = ref; 564 565 return ref; /* success */ 566 } 567 568 static void delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 569 { 570 /* must be called under down_write(xattr_sem) */ 571 struct jffs2_xattr_datum *xd; 572 573 xd = ref->xd; 574 ref->xseqno |= XREF_DELETE_MARKER; 575 ref->ino = ref->ic->ino; 576 ref->xid = ref->xd->xid; 577 spin_lock(&c->erase_completion_lock); 578 ref->next = c->xref_dead_list; 579 c->xref_dead_list = ref; 580 spin_unlock(&c->erase_completion_lock); 581 582 dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) was removed.\n", 583 ref->ino, ref->xid, ref->xseqno); 584 585 unrefer_xattr_datum(c, xd); 586 } 587 588 void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 589 { 590 /* It's called from jffs2_clear_inode() on inode removing. 591 When an inode with XATTR is removed, those XATTRs must be removed. */ 592 struct jffs2_xattr_ref *ref, *_ref; 593 594 if (!ic || ic->nlink > 0) 595 return; 596 597 down_write(&c->xattr_sem); 598 for (ref = ic->xref; ref; ref = _ref) { 599 _ref = ref->next; 600 delete_xattr_ref(c, ref); 601 } 602 ic->xref = NULL; 603 up_write(&c->xattr_sem); 604 } 605 606 void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 607 { 608 /* It's called from jffs2_free_ino_caches() until unmounting FS. */ 609 struct jffs2_xattr_datum *xd; 610 struct jffs2_xattr_ref *ref, *_ref; 611 612 down_write(&c->xattr_sem); 613 for (ref = ic->xref; ref; ref = _ref) { 614 _ref = ref->next; 615 xd = ref->xd; 616 if (atomic_dec_and_test(&xd->refcnt)) { 617 unload_xattr_datum(c, xd); 618 jffs2_free_xattr_datum(xd); 619 } 620 jffs2_free_xattr_ref(ref); 621 } 622 ic->xref = NULL; 623 up_write(&c->xattr_sem); 624 } 625 626 static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 627 { 628 /* success of check_xattr_ref_inode() means taht inode (ic) dose not have 629 * duplicate name/value pairs. If duplicate name/value pair would be found, 630 * one will be removed. 631 */ 632 struct jffs2_xattr_ref *ref, *cmp, **pref, **pcmp; 633 int rc = 0; 634 635 if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED)) 636 return 0; 637 down_write(&c->xattr_sem); 638 retry: 639 rc = 0; 640 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 641 if (!ref->xd->xname) { 642 rc = load_xattr_datum(c, ref->xd); 643 if (unlikely(rc > 0)) { 644 *pref = ref->next; 645 delete_xattr_ref(c, ref); 646 goto retry; 647 } else if (unlikely(rc < 0)) 648 goto out; 649 } 650 for (cmp=ref->next, pcmp=&ref->next; cmp; pcmp=&cmp->next, cmp=cmp->next) { 651 if (!cmp->xd->xname) { 652 ref->xd->flags |= JFFS2_XFLAGS_BIND; 653 rc = load_xattr_datum(c, cmp->xd); 654 ref->xd->flags &= ~JFFS2_XFLAGS_BIND; 655 if (unlikely(rc > 0)) { 656 *pcmp = cmp->next; 657 delete_xattr_ref(c, cmp); 658 goto retry; 659 } else if (unlikely(rc < 0)) 660 goto out; 661 } 662 if (ref->xd->xprefix == cmp->xd->xprefix 663 && !strcmp(ref->xd->xname, cmp->xd->xname)) { 664 if (ref->xseqno > cmp->xseqno) { 665 *pcmp = cmp->next; 666 delete_xattr_ref(c, cmp); 667 } else { 668 *pref = ref->next; 669 delete_xattr_ref(c, ref); 670 } 671 goto retry; 672 } 673 } 674 } 675 ic->flags |= INO_FLAGS_XATTR_CHECKED; 676 out: 677 up_write(&c->xattr_sem); 678 679 return rc; 680 } 681 682 /* -------- xattr subsystem functions --------------- 683 * jffs2_init_xattr_subsystem(c) 684 * is used to initialize semaphore and list_head, and some variables. 685 * jffs2_find_xattr_datum(c, xid) 686 * is used to lookup xdatum while scanning process. 687 * jffs2_clear_xattr_subsystem(c) 688 * is used to release any xattr related objects. 689 * jffs2_build_xattr_subsystem(c) 690 * is used to associate xdatum and xref while super block building process. 691 * jffs2_setup_xattr_datum(c, xid, version) 692 * is used to insert xdatum while scanning process. 693 * -------------------------------------------------- */ 694 void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c) 695 { 696 int i; 697 698 for (i=0; i < XATTRINDEX_HASHSIZE; i++) 699 INIT_LIST_HEAD(&c->xattrindex[i]); 700 INIT_LIST_HEAD(&c->xattr_unchecked); 701 INIT_LIST_HEAD(&c->xattr_dead_list); 702 c->xref_dead_list = NULL; 703 c->xref_temp = NULL; 704 705 init_rwsem(&c->xattr_sem); 706 c->highest_xid = 0; 707 c->highest_xseqno = 0; 708 c->xdatum_mem_usage = 0; 709 c->xdatum_mem_threshold = 32 * 1024; /* Default 32KB */ 710 } 711 712 static struct jffs2_xattr_datum *jffs2_find_xattr_datum(struct jffs2_sb_info *c, uint32_t xid) 713 { 714 struct jffs2_xattr_datum *xd; 715 int i = xid % XATTRINDEX_HASHSIZE; 716 717 /* It's only used in scanning/building process. */ 718 BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING))); 719 720 list_for_each_entry(xd, &c->xattrindex[i], xindex) { 721 if (xd->xid==xid) 722 return xd; 723 } 724 return NULL; 725 } 726 727 void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c) 728 { 729 struct jffs2_xattr_datum *xd, *_xd; 730 struct jffs2_xattr_ref *ref, *_ref; 731 int i; 732 733 for (ref=c->xref_temp; ref; ref = _ref) { 734 _ref = ref->next; 735 jffs2_free_xattr_ref(ref); 736 } 737 738 for (ref=c->xref_dead_list; ref; ref = _ref) { 739 _ref = ref->next; 740 jffs2_free_xattr_ref(ref); 741 } 742 743 for (i=0; i < XATTRINDEX_HASHSIZE; i++) { 744 list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { 745 list_del(&xd->xindex); 746 if (xd->xname) 747 kfree(xd->xname); 748 jffs2_free_xattr_datum(xd); 749 } 750 } 751 752 list_for_each_entry_safe(xd, _xd, &c->xattr_dead_list, xindex) { 753 list_del(&xd->xindex); 754 jffs2_free_xattr_datum(xd); 755 } 756 } 757 758 #define XREF_TMPHASH_SIZE (128) 759 void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c) 760 { 761 struct jffs2_xattr_ref *ref, *_ref; 762 struct jffs2_xattr_ref *xref_tmphash[XREF_TMPHASH_SIZE]; 763 struct jffs2_xattr_datum *xd, *_xd; 764 struct jffs2_inode_cache *ic; 765 struct jffs2_raw_node_ref *raw; 766 int i, xdatum_count = 0, xdatum_unchecked_count = 0, xref_count = 0; 767 int xdatum_orphan_count = 0, xref_orphan_count = 0, xref_dead_count = 0; 768 769 BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING)); 770 771 /* Phase.1 : Merge same xref */ 772 for (i=0; i < XREF_TMPHASH_SIZE; i++) 773 xref_tmphash[i] = NULL; 774 for (ref=c->xref_temp; ref; ref=_ref) { 775 struct jffs2_xattr_ref *tmp; 776 777 _ref = ref->next; 778 if (ref_flags(ref->node) != REF_PRISTINE) { 779 if (verify_xattr_ref(c, ref)) { 780 BUG_ON(ref->node->next_in_ino != (void *)ref); 781 ref->node->next_in_ino = NULL; 782 jffs2_mark_node_obsolete(c, ref->node); 783 jffs2_free_xattr_ref(ref); 784 continue; 785 } 786 } 787 788 i = (ref->ino ^ ref->xid) % XREF_TMPHASH_SIZE; 789 for (tmp=xref_tmphash[i]; tmp; tmp=tmp->next) { 790 if (tmp->ino == ref->ino && tmp->xid == ref->xid) 791 break; 792 } 793 if (tmp) { 794 raw = ref->node; 795 if (ref->xseqno > tmp->xseqno) { 796 tmp->xseqno = ref->xseqno; 797 raw->next_in_ino = tmp->node; 798 tmp->node = raw; 799 } else { 800 raw->next_in_ino = tmp->node->next_in_ino; 801 tmp->node->next_in_ino = raw; 802 } 803 jffs2_free_xattr_ref(ref); 804 continue; 805 } else { 806 ref->next = xref_tmphash[i]; 807 xref_tmphash[i] = ref; 808 } 809 } 810 c->xref_temp = NULL; 811 812 /* Phase.2 : Bind xref with inode_cache and xattr_datum */ 813 for (i=0; i < XREF_TMPHASH_SIZE; i++) { 814 for (ref=xref_tmphash[i]; ref; ref=_ref) { 815 xref_count++; 816 _ref = ref->next; 817 if (is_xattr_ref_dead(ref)) { 818 ref->next = c->xref_dead_list; 819 c->xref_dead_list = ref; 820 xref_dead_count++; 821 continue; 822 } 823 /* At this point, ref->xid and ref->ino contain XID and inode number. 824 ref->xd and ref->ic are not valid yet. */ 825 xd = jffs2_find_xattr_datum(c, ref->xid); 826 ic = jffs2_get_ino_cache(c, ref->ino); 827 if (!xd || !ic) { 828 dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) is orphan.\n", 829 ref->ino, ref->xid, ref->xseqno); 830 ref->xseqno |= XREF_DELETE_MARKER; 831 ref->next = c->xref_dead_list; 832 c->xref_dead_list = ref; 833 xref_orphan_count++; 834 continue; 835 } 836 ref->xd = xd; 837 ref->ic = ic; 838 atomic_inc(&xd->refcnt); 839 ref->next = ic->xref; 840 ic->xref = ref; 841 } 842 } 843 844 /* Phase.3 : Link unchecked xdatum to xattr_unchecked list */ 845 for (i=0; i < XATTRINDEX_HASHSIZE; i++) { 846 list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { 847 xdatum_count++; 848 list_del_init(&xd->xindex); 849 if (!atomic_read(&xd->refcnt)) { 850 dbg_xattr("xdatum(xid=%u, version=%u) is orphan.\n", 851 xd->xid, xd->version); 852 xd->flags |= JFFS2_XFLAGS_DEAD; 853 list_add(&xd->xindex, &c->xattr_unchecked); 854 xdatum_orphan_count++; 855 continue; 856 } 857 if (is_xattr_datum_unchecked(c, xd)) { 858 dbg_xattr("unchecked xdatum(xid=%u, version=%u)\n", 859 xd->xid, xd->version); 860 list_add(&xd->xindex, &c->xattr_unchecked); 861 xdatum_unchecked_count++; 862 } 863 } 864 } 865 /* build complete */ 866 JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum" 867 " (%u unchecked, %u orphan) and " 868 "%u of xref (%u dead, %u orphan) found.\n", 869 xdatum_count, xdatum_unchecked_count, xdatum_orphan_count, 870 xref_count, xref_dead_count, xref_orphan_count); 871 } 872 873 struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c, 874 uint32_t xid, uint32_t version) 875 { 876 struct jffs2_xattr_datum *xd; 877 878 xd = jffs2_find_xattr_datum(c, xid); 879 if (!xd) { 880 xd = jffs2_alloc_xattr_datum(); 881 if (!xd) 882 return ERR_PTR(-ENOMEM); 883 xd->xid = xid; 884 xd->version = version; 885 if (xd->xid > c->highest_xid) 886 c->highest_xid = xd->xid; 887 list_add_tail(&xd->xindex, &c->xattrindex[xid % XATTRINDEX_HASHSIZE]); 888 } 889 return xd; 890 } 891 892 /* -------- xattr subsystem functions --------------- 893 * xprefix_to_handler(xprefix) 894 * is used to translate xprefix into xattr_handler. 895 * jffs2_listxattr(dentry, buffer, size) 896 * is an implementation of listxattr handler on jffs2. 897 * do_jffs2_getxattr(inode, xprefix, xname, buffer, size) 898 * is an implementation of getxattr handler on jffs2. 899 * do_jffs2_setxattr(inode, xprefix, xname, buffer, size, flags) 900 * is an implementation of setxattr handler on jffs2. 901 * -------------------------------------------------- */ 902 struct xattr_handler *jffs2_xattr_handlers[] = { 903 &jffs2_user_xattr_handler, 904 #ifdef CONFIG_JFFS2_FS_SECURITY 905 &jffs2_security_xattr_handler, 906 #endif 907 #ifdef CONFIG_JFFS2_FS_POSIX_ACL 908 &jffs2_acl_access_xattr_handler, 909 &jffs2_acl_default_xattr_handler, 910 #endif 911 &jffs2_trusted_xattr_handler, 912 NULL 913 }; 914 915 static struct xattr_handler *xprefix_to_handler(int xprefix) { 916 struct xattr_handler *ret; 917 918 switch (xprefix) { 919 case JFFS2_XPREFIX_USER: 920 ret = &jffs2_user_xattr_handler; 921 break; 922 #ifdef CONFIG_JFFS2_FS_SECURITY 923 case JFFS2_XPREFIX_SECURITY: 924 ret = &jffs2_security_xattr_handler; 925 break; 926 #endif 927 #ifdef CONFIG_JFFS2_FS_POSIX_ACL 928 case JFFS2_XPREFIX_ACL_ACCESS: 929 ret = &jffs2_acl_access_xattr_handler; 930 break; 931 case JFFS2_XPREFIX_ACL_DEFAULT: 932 ret = &jffs2_acl_default_xattr_handler; 933 break; 934 #endif 935 case JFFS2_XPREFIX_TRUSTED: 936 ret = &jffs2_trusted_xattr_handler; 937 break; 938 default: 939 ret = NULL; 940 break; 941 } 942 return ret; 943 } 944 945 ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size) 946 { 947 struct inode *inode = dentry->d_inode; 948 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 949 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 950 struct jffs2_inode_cache *ic = f->inocache; 951 struct jffs2_xattr_ref *ref, **pref; 952 struct jffs2_xattr_datum *xd; 953 struct xattr_handler *xhandle; 954 ssize_t len, rc; 955 int retry = 0; 956 957 rc = check_xattr_ref_inode(c, ic); 958 if (unlikely(rc)) 959 return rc; 960 961 down_read(&c->xattr_sem); 962 retry: 963 len = 0; 964 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 965 BUG_ON(ref->ic != ic); 966 xd = ref->xd; 967 if (!xd->xname) { 968 /* xdatum is unchached */ 969 if (!retry) { 970 retry = 1; 971 up_read(&c->xattr_sem); 972 down_write(&c->xattr_sem); 973 goto retry; 974 } else { 975 rc = load_xattr_datum(c, xd); 976 if (unlikely(rc > 0)) { 977 *pref = ref->next; 978 delete_xattr_ref(c, ref); 979 goto retry; 980 } else if (unlikely(rc < 0)) 981 goto out; 982 } 983 } 984 xhandle = xprefix_to_handler(xd->xprefix); 985 if (!xhandle) 986 continue; 987 if (buffer) { 988 rc = xhandle->list(inode, buffer+len, size-len, xd->xname, xd->name_len); 989 } else { 990 rc = xhandle->list(inode, NULL, 0, xd->xname, xd->name_len); 991 } 992 if (rc < 0) 993 goto out; 994 len += rc; 995 } 996 rc = len; 997 out: 998 if (!retry) { 999 up_read(&c->xattr_sem); 1000 } else { 1001 up_write(&c->xattr_sem); 1002 } 1003 return rc; 1004 } 1005 1006 int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname, 1007 char *buffer, size_t size) 1008 { 1009 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 1010 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 1011 struct jffs2_inode_cache *ic = f->inocache; 1012 struct jffs2_xattr_datum *xd; 1013 struct jffs2_xattr_ref *ref, **pref; 1014 int rc, retry = 0; 1015 1016 rc = check_xattr_ref_inode(c, ic); 1017 if (unlikely(rc)) 1018 return rc; 1019 1020 down_read(&c->xattr_sem); 1021 retry: 1022 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 1023 BUG_ON(ref->ic!=ic); 1024 1025 xd = ref->xd; 1026 if (xd->xprefix != xprefix) 1027 continue; 1028 if (!xd->xname) { 1029 /* xdatum is unchached */ 1030 if (!retry) { 1031 retry = 1; 1032 up_read(&c->xattr_sem); 1033 down_write(&c->xattr_sem); 1034 goto retry; 1035 } else { 1036 rc = load_xattr_datum(c, xd); 1037 if (unlikely(rc > 0)) { 1038 *pref = ref->next; 1039 delete_xattr_ref(c, ref); 1040 goto retry; 1041 } else if (unlikely(rc < 0)) { 1042 goto out; 1043 } 1044 } 1045 } 1046 if (!strcmp(xname, xd->xname)) { 1047 rc = xd->value_len; 1048 if (buffer) { 1049 if (size < rc) { 1050 rc = -ERANGE; 1051 } else { 1052 memcpy(buffer, xd->xvalue, rc); 1053 } 1054 } 1055 goto out; 1056 } 1057 } 1058 rc = -ENODATA; 1059 out: 1060 if (!retry) { 1061 up_read(&c->xattr_sem); 1062 } else { 1063 up_write(&c->xattr_sem); 1064 } 1065 return rc; 1066 } 1067 1068 int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname, 1069 const char *buffer, size_t size, int flags) 1070 { 1071 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 1072 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 1073 struct jffs2_inode_cache *ic = f->inocache; 1074 struct jffs2_xattr_datum *xd; 1075 struct jffs2_xattr_ref *ref, *newref, **pref; 1076 uint32_t length, request; 1077 int rc; 1078 1079 rc = check_xattr_ref_inode(c, ic); 1080 if (unlikely(rc)) 1081 return rc; 1082 1083 request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size); 1084 rc = jffs2_reserve_space(c, request, &length, 1085 ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE); 1086 if (rc) { 1087 JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); 1088 return rc; 1089 } 1090 1091 /* Find existing xattr */ 1092 down_write(&c->xattr_sem); 1093 retry: 1094 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 1095 xd = ref->xd; 1096 if (xd->xprefix != xprefix) 1097 continue; 1098 if (!xd->xname) { 1099 rc = load_xattr_datum(c, xd); 1100 if (unlikely(rc > 0)) { 1101 *pref = ref->next; 1102 delete_xattr_ref(c, ref); 1103 goto retry; 1104 } else if (unlikely(rc < 0)) 1105 goto out; 1106 } 1107 if (!strcmp(xd->xname, xname)) { 1108 if (flags & XATTR_CREATE) { 1109 rc = -EEXIST; 1110 goto out; 1111 } 1112 if (!buffer) { 1113 ref->ino = ic->ino; 1114 ref->xid = xd->xid; 1115 ref->xseqno |= XREF_DELETE_MARKER; 1116 rc = save_xattr_ref(c, ref); 1117 if (!rc) { 1118 *pref = ref->next; 1119 spin_lock(&c->erase_completion_lock); 1120 ref->next = c->xref_dead_list; 1121 c->xref_dead_list = ref; 1122 spin_unlock(&c->erase_completion_lock); 1123 unrefer_xattr_datum(c, xd); 1124 } else { 1125 ref->ic = ic; 1126 ref->xd = xd; 1127 ref->xseqno &= ~XREF_DELETE_MARKER; 1128 } 1129 goto out; 1130 } 1131 goto found; 1132 } 1133 } 1134 /* not found */ 1135 if (flags & XATTR_REPLACE) { 1136 rc = -ENODATA; 1137 goto out; 1138 } 1139 if (!buffer) { 1140 rc = -ENODATA; 1141 goto out; 1142 } 1143 found: 1144 xd = create_xattr_datum(c, xprefix, xname, buffer, size); 1145 if (IS_ERR(xd)) { 1146 rc = PTR_ERR(xd); 1147 goto out; 1148 } 1149 up_write(&c->xattr_sem); 1150 jffs2_complete_reservation(c); 1151 1152 /* create xattr_ref */ 1153 request = PAD(sizeof(struct jffs2_raw_xref)); 1154 rc = jffs2_reserve_space(c, request, &length, 1155 ALLOC_NORMAL, JFFS2_SUMMARY_XREF_SIZE); 1156 down_write(&c->xattr_sem); 1157 if (rc) { 1158 JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); 1159 unrefer_xattr_datum(c, xd); 1160 up_write(&c->xattr_sem); 1161 return rc; 1162 } 1163 if (ref) 1164 *pref = ref->next; 1165 newref = create_xattr_ref(c, ic, xd); 1166 if (IS_ERR(newref)) { 1167 if (ref) { 1168 ref->next = ic->xref; 1169 ic->xref = ref; 1170 } 1171 rc = PTR_ERR(newref); 1172 unrefer_xattr_datum(c, xd); 1173 } else if (ref) { 1174 delete_xattr_ref(c, ref); 1175 } 1176 out: 1177 up_write(&c->xattr_sem); 1178 jffs2_complete_reservation(c); 1179 return rc; 1180 } 1181 1182 /* -------- garbage collector functions ------------- 1183 * jffs2_garbage_collect_xattr_datum(c, xd, raw) 1184 * is used to move xdatum into new node. 1185 * jffs2_garbage_collect_xattr_ref(c, ref, raw) 1186 * is used to move xref into new node. 1187 * jffs2_verify_xattr(c) 1188 * is used to call do_verify_xattr_datum() before garbage collecting. 1189 * jffs2_release_xattr_datum(c, xd) 1190 * is used to release an in-memory object of xdatum. 1191 * jffs2_release_xattr_ref(c, ref) 1192 * is used to release an in-memory object of xref. 1193 * -------------------------------------------------- */ 1194 int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd, 1195 struct jffs2_raw_node_ref *raw) 1196 { 1197 uint32_t totlen, length, old_ofs; 1198 int rc = 0; 1199 1200 down_write(&c->xattr_sem); 1201 if (xd->node != raw) 1202 goto out; 1203 if (xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)) 1204 goto out; 1205 1206 rc = load_xattr_datum(c, xd); 1207 if (unlikely(rc)) { 1208 rc = (rc > 0) ? 0 : rc; 1209 goto out; 1210 } 1211 old_ofs = ref_offset(xd->node); 1212 totlen = PAD(sizeof(struct jffs2_raw_xattr) 1213 + xd->name_len + 1 + xd->value_len); 1214 rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XATTR_SIZE); 1215 if (rc) { 1216 JFFS2_WARNING("jffs2_reserve_space_gc()=%d, request=%u\n", rc, totlen); 1217 goto out; 1218 } 1219 rc = save_xattr_datum(c, xd); 1220 if (!rc) 1221 dbg_xattr("xdatum (xid=%u, version=%u) GC'ed from %#08x to %08x\n", 1222 xd->xid, xd->version, old_ofs, ref_offset(xd->node)); 1223 out: 1224 if (!rc) 1225 jffs2_mark_node_obsolete(c, raw); 1226 up_write(&c->xattr_sem); 1227 return rc; 1228 } 1229 1230 int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref, 1231 struct jffs2_raw_node_ref *raw) 1232 { 1233 uint32_t totlen, length, old_ofs; 1234 int rc = 0; 1235 1236 down_write(&c->xattr_sem); 1237 BUG_ON(!ref->node); 1238 1239 if (ref->node != raw) 1240 goto out; 1241 if (is_xattr_ref_dead(ref) && (raw->next_in_ino == (void *)ref)) 1242 goto out; 1243 1244 old_ofs = ref_offset(ref->node); 1245 totlen = ref_totlen(c, c->gcblock, ref->node); 1246 1247 rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XREF_SIZE); 1248 if (rc) { 1249 JFFS2_WARNING("%s: jffs2_reserve_space_gc() = %d, request = %u\n", 1250 __FUNCTION__, rc, totlen); 1251 rc = rc ? rc : -EBADFD; 1252 goto out; 1253 } 1254 rc = save_xattr_ref(c, ref); 1255 if (!rc) 1256 dbg_xattr("xref (ino=%u, xid=%u) GC'ed from %#08x to %08x\n", 1257 ref->ic->ino, ref->xd->xid, old_ofs, ref_offset(ref->node)); 1258 out: 1259 if (!rc) 1260 jffs2_mark_node_obsolete(c, raw); 1261 up_write(&c->xattr_sem); 1262 return rc; 1263 } 1264 1265 int jffs2_verify_xattr(struct jffs2_sb_info *c) 1266 { 1267 struct jffs2_xattr_datum *xd, *_xd; 1268 struct jffs2_eraseblock *jeb; 1269 struct jffs2_raw_node_ref *raw; 1270 uint32_t totlen; 1271 int rc; 1272 1273 down_write(&c->xattr_sem); 1274 list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { 1275 rc = do_verify_xattr_datum(c, xd); 1276 if (rc < 0) 1277 continue; 1278 list_del_init(&xd->xindex); 1279 spin_lock(&c->erase_completion_lock); 1280 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { 1281 if (ref_flags(raw) != REF_UNCHECKED) 1282 continue; 1283 jeb = &c->blocks[ref_offset(raw) / c->sector_size]; 1284 totlen = PAD(ref_totlen(c, jeb, raw)); 1285 c->unchecked_size -= totlen; c->used_size += totlen; 1286 jeb->unchecked_size -= totlen; jeb->used_size += totlen; 1287 raw->flash_offset = ref_offset(raw) 1288 | ((xd->node == (void *)raw) ? REF_PRISTINE : REF_NORMAL); 1289 } 1290 if (xd->flags & JFFS2_XFLAGS_DEAD) 1291 list_add(&xd->xindex, &c->xattr_dead_list); 1292 spin_unlock(&c->erase_completion_lock); 1293 } 1294 up_write(&c->xattr_sem); 1295 return list_empty(&c->xattr_unchecked) ? 1 : 0; 1296 } 1297 1298 void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 1299 { 1300 /* must be called under spin_lock(&c->erase_completion_lock) */ 1301 if (atomic_read(&xd->refcnt) || xd->node != (void *)xd) 1302 return; 1303 1304 list_del(&xd->xindex); 1305 jffs2_free_xattr_datum(xd); 1306 } 1307 1308 void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 1309 { 1310 /* must be called under spin_lock(&c->erase_completion_lock) */ 1311 struct jffs2_xattr_ref *tmp, **ptmp; 1312 1313 if (ref->node != (void *)ref) 1314 return; 1315 1316 for (tmp=c->xref_dead_list, ptmp=&c->xref_dead_list; tmp; ptmp=&tmp->next, tmp=tmp->next) { 1317 if (ref == tmp) { 1318 *ptmp = tmp->next; 1319 break; 1320 } 1321 } 1322 jffs2_free_xattr_ref(ref); 1323 } 1324